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Hot-rolled steel sheet pile and its production method

A technology of hot-rolled steel plates and production methods, which can be applied to sheet pile walls, buildings, and infrastructure engineering, etc., and can solve problems such as high prices, hazards in use, waste of resources, etc., to ensure purity and continuity, and reduce production cost, the effect of guaranteeing extended performance

Active Publication Date: 2020-07-21
莱芜泰铼经贸有限公司
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Adding the above three elements in the production of hot-rolled steel sheet piles, on the one hand, under the condition of high nitrogen and oxygen content in molten steel or adding ferrovanadium nitride, it is easy to directly produce nitrides and cause stress cracks, which is easy to cause waste products in production. Qualified products also have internal stress due to nitrides, which bring serious potential hazards to subsequent use; on the other hand, the current domestic prices of niobium, vanadium, and titanium alloys remain high, resulting in steel plates produced by alloying niobium, vanadium, and titanium The price of piles is relatively high; moreover, relatively rare niobium, vanadium, and titanium alloy resources are used to produce ordinary hot-rolled steel sheet piles, resulting in a significant waste of resources

Method used

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  • Hot-rolled steel sheet pile and its production method
  • Hot-rolled steel sheet pile and its production method
  • Hot-rolled steel sheet pile and its production method

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0042] Example 1: Preparation of hot-rolled steel sheet piles with grade Q295P

[0043] The chemical composition and weight percentage of the steel are: C 0.30%, Si 0.17%, Mn 0.77%, P 0.019%, S0.010%, and the rest are Fe and unavoidable impurities.

[0044] Its production method comprises the following steps:

[0045] (1) Converter or electric furnace smelting; during smelting, the tapping temperature of smelting is controlled to be 1620-1660°C.

[0046] (2) Refining in the refining furnace; control the basicity of the slag to be greater than 3.0.

[0047] (3) Continuous casting and casting; the tundish temperature of the continuous casting machine is 1500-1530°C, the superheat of the tundish is controlled at 20-30°C, and the casting speed is 0.6-0.8m / min.

[0048] (4) Steel billet heating; when the steel billet is heated, the temperature of the steel rolling heating furnace is 1250-1300°C.

[0049] (5) The finished steel sheet pile is obtained by hot rolling; the hot rolli...

Embodiment 2

[0050] Example 2: Preparation of hot-rolled steel sheet piles with grade Q345P

[0051] The chemical composition and weight percentage of the steel are: C 0.32%, Si 0.16%, Mn 0.77%, P 0.023%, S0.019%, and the rest are Fe and unavoidable impurities.

[0052] Its production method comprises the following steps:

[0053] (1) Converter or electric furnace smelting; during smelting, the tapping temperature of smelting is controlled to be 1620-1660°C.

[0054] (2) Refining in the refining furnace; control the basicity of the slag to be greater than 3.0.

[0055] (3) Continuous casting and casting; the tundish temperature of the continuous casting machine is 1500-1530°C, the superheat of the tundish is controlled at 20-30°C, and the casting speed is 0.6-0.8m / min.

[0056] (4) Steel billet heating; when the steel billet is heated, the temperature of the steel rolling heating furnace is 1250-1300°C.

[0057] (5) The finished steel sheet pile is produced by hot rolling; the hot rolli...

Embodiment 3

[0058] Example 3: Preparation of hot-rolled steel sheet piles with the grade Q390P (please add the amount of each element below)

[0059] The chemical composition and weight percentage of the steel are: C 0.37%, Si 0.15%, Mn 0.85%, P 0.018%, S0.018%, and the rest are Fe and unavoidable impurities.

[0060] Its production method comprises the following steps:

[0061] (1) Converter or electric furnace smelting; during smelting, the tapping temperature for smelting is controlled to be 1610-1650°C.

[0062] (2) Refining in the refining furnace; control the basicity of the slag to be greater than 3.0.

[0063] (3) Continuous casting and casting; the tundish temperature of the continuous casting machine is 1490-1520°C, the superheat of the tundish is controlled at 20-30°C, and the casting speed is 0.5-0.75m / min.

[0064] (4) Steel billet heating; when the steel billet is heated, the temperature of the steel rolling heating furnace is 1230-1280°C.

[0065] (5) The finished steel ...

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Abstract

The invention discloses a hot-rolled steel sheet pile. The hot-rolled steel sheet pile comprises, by weight, 0.21%-0.50% of C, no more than 0.17% of Si, 0.7%-0.99% of Mn, no more than 0.030% of P, nomore than 0.030% of S, and the balance Fe and inevitable impurities. According to the hot-rolled steel sheet pile, effective components in molten steel are adjusted, the quantity of carbon is increased, the quantity of manganese, silicon, phosphorus and sulfur is decreased, and all chemical components in the molten steel are reasonably proportioned, so that the production cost is greatly reduced without adding a niobium-vanadium-titanium alloy, and it is guaranteed that the mechanical property of the hot-rolled steel sheet pile meets the requirement for different levels of mechanical properties of the GB / T 20993-2014 standard.

Description

technical field [0001] The invention relates to the technical field of steel production, in particular to a hot-rolled steel sheet pile and a production method thereof. Background technique [0002] Steel sheet pile is a type of steel with a lock, and its cross-section is straight, U-shaped, and Z-shaped. Steel sheet pile is a necessity for water conservancy project construction, cofferdam construction, tunnel construction, roadbed engineering, and bridge foundation engineering. Steel sheet piles have the following advantages: high quality (high strength, light weight, and good water resistance); simple construction, short construction period, and cheap construction costs; good durability, with a service life of 20-50 years; the use of steel sheet piles can not be restricted by weather conditions, In the process of using steel sheet piles, it can simplify the complicated procedures for checking the performance of materials or systems; it has good interchangeability, can be r...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C22C38/04C22C38/02E02D5/04
CPCC22C38/002C22C38/02C22C38/04E02D5/04
Inventor 王勇峰董昌兴任旭东
Owner 莱芜泰铼经贸有限公司
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